Why not just increase patrols for people breaking the law? Or change the radar to use a different frequency?
Honestly, if I had to decide between the ability to choose free software, and having all flights grounded indefinitely I would go with the software. I know my opinion is not the majority though.
It would have been a lot easier for the FCC to have just not allowed unlicensed use on these channels than move all the weather RADAR. Instead, they put a lot of effort into rules that would make unlicensed use possible alongside it. Please remember this before firing off your letters to the FCC, and think about the alternative if the Commission can't count of reliable DFS.